Las Vegas authorities say more than 20 people are dead and 100 people are wounded after a man opened fire on an outdoor concert late Sunday.

Catherine Park, WXIA5:17 AM. CDT October 02, 2017

LAS VEGAS, NV - OCTOBER 01: A man in a wheelchair is taken away from the Route 91 Harvest country music festival after apparent gun fire was heard on October 1, 2017 in Las Vegas, Nevada. There are reports of an active shooter around the Mandalay Bay Resort and Casino. (Photo by David Becker/Getty Images)(Photo: David Becker, 2017 Getty Images)

Just moments after tragedy struck a concert on the Las Vegas strip, people took to social media to share terrifying video of what transpired late Sunday night as gunfire rained down on thousands of concert patrons.